ASTM D1684-96

Standard Practice for Lighting Cotton Classing Rooms for Color Grading

SCOPE
1.1 This practice covers practices in general use in the United States for lighting cotton classing rooms, provides general background information regarding the development and establishment of these practices, and prescribes a method of test for appraising the color quality of lamps procured for this purpose.  
1.2 This standard does not purport to addressall of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

• Status: Historical
• Publication Date: 09-Oct-1996
• Technical Committee: D13 - Textiles
• Drafting Committee: D13.11 - Cotton Fibers

Relations

• Replaced By: ASTM D1684-96(2002) - Standard Practice for Lighting Cotton Classing Rooms for Color Grading
• Effective Date: 10-Oct-1996

Standards Content (Sample)

Designation: D 1684 – 96
Standard Practice for
1
Lighting Cotton Classing Rooms for Color Grading
This standard is issued under the fixed designation D 1684; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
Until 1940, practically all cotton classing was done in daylight, much of it in specially skylighted
rooms designed to provide sufficient and uniform lighting on the classing tables. Cotton classification
or classing is the art and science of describing the quality of cotton according to the official standards
of the United States. Grade is divided into two categories—color grade and leaf grade. Because color
grade is an important quality factor in establishing the price and use of cotton, the color quality of
lighting is important. The cotton classer attempts to class cotton on the basis of the color the sample
and the standard would have in daylight. In classing rapidly he refers to physical standards only
occasionally each day; therefore it is most important that the lighting in a classing room shall not only
provide a constant color but that it shall make the color of cotton appear as nearly as possible as it
would in daylight so that he can take full advantage of training and memory.
2
In the USA, daylight at about 7500 K is what the cotton classer (1,2,3), (as well as color matchers
in other industries (4,5,6)) has found in practice to be the minimum color temperature of preferred
daylight.
1. Scope The Classification of Cotton, Agricultural Handbook Num-
5
ber 566.
1.1 This practice covers practices in general use in the
United States for lighting cotton classing rooms, provides
3. Terminology
general background information regarding the development
3.1 Definitions:
and establishment of these practices, and prescribes a test
3.1.1 color grading, n—the act of identifying a specimen by
method for appraising the color quality of lamps procured for
a color grade or color score, that is specific to the color and the
this purpose.
material graded.
1.2 This standard does not purport to address all of the
3.1.2 illumination, n—in lighting, the density or flux of light
safety concerns, if any, associated with its use. It is the
on a unit area of surface.
responsibility of the user of this standard to establish appro-
3.1.2.1 Discussion—The lux (lx) is the SI unit of illumina-
priate safety and health practices and determine the applica-
tion and equals a luminous flux of one lumen per square metre
bility of regulatory limitations prior to use.
of surface. The footcandle (fc) is the inch-pound unit of
2. Referenced Documents illumination and equals a luminous flux of one lumen per
square foot of surface. To convert footcandles to lux, multiply
2.1 ASTM Standards:
3
by 10.76391 (exactly).
D 123 Terminology Relating to Textiles
3.1.3 kelvin, n—the unit of thermodynamic temperature; the
D 1535 Practice for Specifying Color by the Munsell Sys-
4
SI unit of temperature for which an interval of one kelvin (K)
tem
equals exactly an interval of one degree Celsius (1°C) and for
2.2 Other Documents:
which a level of 273.15 K equals exactly 0°C.
3.1.4 For definitions of other textile terms used in this
practice, refer to Terminology D 123.
1
This practice is under the jurisdiction of ASTM Committee D-13 on Textiles,
4. Summary of Practice
and is the direct responsibility of Subcommittee D13.11 on Cotton Fibers.
Current edition approved Oct 10, 1996. Published February 1997. Originally
4.1 Artificial lighting is used in cotton classing rooms to
published as D 1684 – 59 T. Last previous edition D 1684 – 90.
2
simulate ideal daylight conditions in north latitudes with a
The boldface numbers in parentheses refer to references listed at the end of this
practice.
3
Annual Book of ASTM Standards, Vol 07.01.
4
Annual Book of ASTM Standards, Vol 06.01.
5
Available from Cotton Div., Agricultural Marketing Service, U. S. Department
of Agriculture, Washington, DC 20250.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
1

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D 1684
moderately overcast sky. The quality and quantity of illumina- 5.2 Uniform lighting conditions permit classers to go from
tion, the geometry of illumination, the type of lighting unit and one classing room to another without having to make adjust-
pattern for installation, the color of surroundings, and mainte- ments for wide differences in the amount and quality of
nance of lighting equipment are specified in this practice. lighting.
5. Significance and Use 6. Quality of Illumination
5.1 This practice is useful for establishing and maintaining 6.1 The standard for color quality of illumination is the
standard lighting conditions in cotton classing rooms. Thi
...